P1093 fault code: what it means

P1093: Isuzu code: fuel rail pressure too low (rail pressure falls short under load).

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

clogged fuel filter
fuel leak on the high-pressure side
faulty or leaking injector
fuel rail pressure sensor or supply pump

P1093 by make

Isuzu

Isuzu code: fuel rail pressure too low (rail pressure falls short under load).

Usual causes: clogged fuel filter; fuel leak on the high-pressure side; faulty or leaking injector; fuel rail pressure sensor or supply pump

Subaru

Subaru code: tumble generator valve (TGV) #2, left side, stuck closed.

Usual causes: seized TGV shaft or carbon build-up; faulty TGV motor; TGV wiring fault

What the repair usually costs

CVT valve body replacement (remanufactured, in car)NZ$1,280–NZ$2,420 · A$1,200–A$2,400
High-pressure fuel pump (GDI petrol or common-rail diesel)NZ$1,140–NZ$4,280 · A$1,060–A$3,800
Intake valve carbon clean (walnut blast, direct injection)NZ$530–NZ$1,190 · A$560–A$1,240
Full / logbook service (SUV / diesel ute / 4WD)NZ$410–NZ$800 · A$400–A$780

Not sure what P1093 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.